The Supreme Court rejected President Trump's executive order restricting birthright citizenship in a 6-3 ruling, but the justice Trump once called his "new hero" may have handed conservatives something more durable than any executive action could deliver. Justice Brett Kavanaugh, voting with the majority to block Executive Order 14160, wrote a concurring opinion that lays out a clear path for Congress to limit birthright citizenship through ordinary legislation, Fox News Digital reported.
The distinction matters. While the ruling itself blocked Trump's order, Kavanaugh's concurrence argues the case should have been decided on statutory grounds, not constitutional ones. That framing preserves the possibility that Congress could amend federal law to create exceptions to automatic citizenship for children born to parents who are in the country illegally or only temporarily.
Within hours, Republican lawmakers seized on the opening. The question now is whether the GOP has the votes, the discipline, and the political will to pursue either a legislative fix or the far heavier lift of a constitutional amendment.
Kavanaugh joined the six-justice majority that struck down EO 14160, which would have restricted automatic citizenship to children born to U.S. citizens or permanent residents. But his concurrence parted sharply from the majority's reasoning.
Where a 5-4 majority concluded that the Fourteenth Amendment's citizenship clause itself protects birthright citizenship, Kavanaugh argued the president simply lacked the authority to override a statute Congress had already passed. He wrote:
"Congress could, consistent with the Fourteenth Amendment, amend §1401(a) or otherwise enact new legislation establishing exceptions to birthright citizenship for children born to foreign citizens unlawfully or temporarily in the country."
He grounded that argument in the 1898 landmark case United States v. Wong Kim Ark, which established that most people born on U.S. soil automatically become citizens. That ruling recognized four categories of exceptions. Kavanaugh argued that illegal immigrants and temporary visitors fit neatly alongside those existing carve-outs.
"Those two categories of foreign citizens, namely, those unlawfully or temporarily in the country, are relevantly similar to the four categories of persons recognized as exceptions in Wong Kim Ark."
The logic is straightforward: if the Constitution already allows exceptions, Congress can define new ones. The president just can't do it alone.
This is not the first time Kavanaugh has charted this course. In a Trump tariff case earlier this year involving the International Emergency Economic Powers Act, Kavanaugh wrote a similar concurrence arguing the president had "checked the wrong statutory box." In that case, too, Kavanaugh sided against the administration's chosen legal vehicle while leaving open a path through different authority.
Trump responded to that earlier concurrence by calling Kavanaugh his "new hero" on Truth Social. The pattern is notable: Kavanaugh has emerged as a justice willing to tell the executive branch it overreached while simultaneously telling Congress it has the power to act. That is not obstruction. It is constitutional order.
The National Review reported that Chief Justice John Roberts authored the majority opinion, writing that children born on U.S. soil to foreign nationals "are citizens at birth" under the Constitution. Justices Clarence Thomas, Samuel Alito, and Neil Gorsuch dissented. Alito called the decision "one of the most important decisions in the history of the Court" and "a serious mistake."
That the Court's most senior conservative justices dissented while Kavanaugh carved a middle path tells you something about where the real legal action now sits: not at the Court, but in Congress.
House Speaker Mike Johnson spoke to reporters hours after the ruling came down. He framed birthright citizenship as a policy that had been corrupted beyond its original purpose.
"It's one of those things that was intended to serve a noble and important purpose and has been thwarted and overused and abused."
Johnson also acknowledged the constitutional stakes: "I'm sure that the conclusion from this decision is you have to amend the Constitution to fix that." That tracks with the amendment push already underway in the Senate.
Sen. Rand Paul of Kentucky, who introduced a constitutional amendment months before the ruling, renewed his call on X: "After the Supreme Court decision, that amendment matters more than ever. I'm asking my colleagues to take it seriously and help me get this passed."
Sen. Mike Lee of Utah struck a similar tone, also posting on X: "The long fight for a constitutional amendment begins now. We must explicitly exclude foreign nationals who break our laws, violate our borders, or exploit loopholes to make their families American."
Sen. Tom Cotton of Arkansas has already introduced the Constitutional Citizenship Clarification Act, which Republicans pointed to as existing legislation that could advance through Kavanaugh's framework. Sens. John Cornyn of Texas and Rick Scott of Florida have separate proposals targeting birth tourism specifically. Sen. Eric Schmitt of Missouri warned that the ruling ignored national security concerns related to China and said he is pushing both a constitutional amendment and standalone legislation.
The Supreme Court faced a packed docket heading into this term's final stretch, and the birthright case was always expected to be among the most consequential.
President Trump weighed in on Truth Social, making clear he favors the legislative route Kavanaugh described over the constitutional amendment several senators are pursuing.
"No long and unwieldy Constitutional Amendment is necessary! Congress should start TODAY to work on ending expensive and unfair to our Country, Birthright Citizenship. They will have my Complete and Total Support!"
That puts Trump squarely in Kavanaugh's lane, and potentially at odds with senators like Paul and Lee who believe only an amendment can survive future court challenges.
Notre Dame Law School professor Haley Proctor told Fox News Digital that both paths carry real weight but different risks. She noted that Justice Thomas, in the final paragraph of his dissent, expressed doubt the ruling would endure.
"Justice Thomas says in the final paragraph of his dissent that he's not confident that the decision is going to stand the test of time, so it could well be that the court would revisit it if Congress were to take the steps that Justice Kavanaugh describes."
But Proctor also cautioned against overconfidence. "This is an important decision. I don't think the court's going to revisit it lightly, and the only sure way to get a new answer here would be to amend the Constitution."
Legal analyst Jonathan Turley had previously predicted the administration would likely lose this fight at the Supreme Court, making the post-ruling pivot to Congress all the more expected.
With EO 14160 now unenforceable, the Department of Justice announced it would pivot to a crackdown on birth tourism by targeting alleged visa fraud and related criminal conduct. That approach sidesteps the constitutional question entirely and focuses on enforcement tools already available under existing law.
The move reflects a practical reality: even after a loss at the Supreme Court, the executive branch retains significant authority to combat the exploitation of birthright citizenship through immigration fraud enforcement. It also signals the administration is not walking away from the issue.
The Washington Examiner noted that the same ruling delivered a separate win for the administration by limiting federal judges' power to issue nationwide injunctions. Justice Amy Coney Barrett's majority opinion held that district courts had exceeded their authority by issuing sweeping universal blocks on executive orders, a tool opponents had used at least 25 times against Trump policies between January 20 and late April alone. That figure exceeds the total number of nationwide injunctions issued during the entire eight-year Obama administration.
Barrett wrote that "federal courts do not exercise general oversight of the Executive Branch" and took a pointed jab at the dissent, writing that "Justice Jackson decries an imperial Executive while embracing an imperial Judiciary."
The Court has shown a willingness to check executive overreach while simultaneously backing the administration on immigration enforcement in other cases this term.
The history here matters. Congress first codified the Fourteenth Amendment's birthright citizenship language into federal statute in 1940 and carried it into the Immigration and Nationality Act of 1952. That means the current law is a product of mid-twentieth-century legislative choices, not an immutable feature of the Constitution itself, at least in Kavanaugh's reading.
Whether Congress can amend §1401(a) without triggering a new constitutional challenge remains an open question. A 5-4 majority of the Court concluded that the citizenship clause itself protects birthright citizenship, which would seem to foreclose a purely statutory fix. But Kavanaugh's concurrence explicitly disagrees with that conclusion, and Thomas's dissent suggests at least three justices share his skepticism.
That leaves the math uncertain. If Congress passes legislation along the lines Kavanaugh described, and the law is challenged, the Court would face the question again, potentially with a different composition or a more developed record. Kavanaugh himself has already tipped his hand on how he would rule.
The constitutional amendment route is cleaner but far harder. It requires two-thirds of both chambers and ratification by three-fourths of state legislatures. No one in Washington pretends that threshold is easy to meet.
Kavanaugh's concurrence has also drawn attention to a dynamic that has played out repeatedly on the current Court: the tension between justices who read executive power broadly and those who insist Congress must act first.
The ruling does not resolve the underlying policy debate. It does not address the scale of birth tourism. It does not answer whether the Reconstruction-era Congress that drafted the Fourteenth Amendment envisioned a world of mass international travel and large-scale illegal immigration, a point Kavanaugh raised directly in his concurrence.
It does not settle whether children born to parents who crossed the border illegally, or who arrived on temporary visas with no intention of remaining, should receive the same automatic citizenship as children of lawful permanent residents. Those are questions of policy, not just law, and they belong in Congress.
The Court told the president he cannot rewrite immigration law by executive order. Fair enough. Now the question is whether Congress will do what Kavanaugh said it can.
The roadmap is on the table. The only thing missing is the will to follow it.